A scanning projection apparatus includes: an irradiation unit that irradiates a biological tissue with detection light； a light detection unit that detects light that is radiated from the tissue irradiated with the detection light； an image generation unit that generates data on an image about the tissue by using a detection result of the light detection unit； and a projection unit including a projection optical system that scans the tissue with visible light on the basis of the data, the projection unit being configured to project the image on the tissue through the scanning with the visible light.
